Doctors altered a person's genes with CRISPR for the first t
What is CRISPR?
CRISPR stands for Clustered, Regularly Interspaced Short Palindromic Repeats. They are repeating sequences of DNA that when matched with an enzyme—in this case, Cas9—act like DNA-cutting scissors and can chop, remove, and replace various segments of DNA.

Last week, a young woman with sickle cell anaemia became the first person in the United States to have her cells altered with CRISPR gene-editing technology.
for the first time, doctors in the United States used the gene-editing tool CRISPR to attempt to remedy a genetic disease in a living person.

Victoria Gray, a 41-year-old woman from Mississippi was born with sickle cell disease, an often painful and debilitating condition caused by a genetic mutation that alters the shape of red blood cells. As of now, only one treatment for the condition exists—a donor transplant that works for just 10 per cent of patients—but doctors think editing cells extracted from Gray’s own bone marrow could restore proper red blood cell formation. If successful, it could prove to be the treatment 90 per cent of sickle cell patients have been waiting for.
doctors removed stem cells from Gray’s bone marrow and used CRISPR to tweak the DNA to turn on a specific protein that would allow for proper red blood cell production.

Source: https://www.popsci.com/crispr-gene-editing-treatment-sickle-cell-anemia/
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